No word on what forced the emergency landing. And tonight in boston, digging out, another emergency. A building collapsing under ice. Abc's ron claiborne is there tonight. Ron. Reporter: David, boston got well over a foot of snow, and now hit with the arctic air that he was talking about. Earlier this morning, the temperature around 0 and STRUGGLED TO GET INTO THE 20s. The new challenge here and throughout the region, dealing with all of the snow that we got. The light and fluffy snow is now hardened into an icy, solid mass. Lining streets and growing into miniature mountain ranges. Major streets are well-plowed, but secondary roads are hard-packed. And from maine to maryland, plenty of shovel do. Here in boston, more than 17 inches of snow. It's a wicked lot of snow. Reporter: And all of that snow has to go somewhere. Where does it go? We'll haul it way. We actually have -- Reporter: To where? Snow farm. Doesn't mean we grow snow, we dump snow. Reporter: In massachusetts, an historic building that caught fire during the storm collapsed under the weight of ice formed by all the water used by fire fighters to douse the blaze. And now a new danger from above, icicles. The next two or three days are especially tricky as temperatures seesaw. Cold today, much warmer in the next couple of days. Rises well above freezing and then rain and then temperatures plunging again back into the single digits. That's the recipe for a lot of ice. Ron claiborne with the boston skyline. And the know behind him tonight.

This transcript has been automatically generated and may not be 100% accurate.

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